binary to hexadecimal in c

1#include <math.h>
2#include <stdio.h>
3int convert(long long n);
4int main() {
5    long long n;
6    printf("Enter a binary number: ");
7    scanf("%lld", &n);
8    printf("%lld in binary = %d in decimal", n, convert(n));
9    return 0;
10}
11
12int convert(long long n) {
13    int dec = 0, i = 0, rem;
14    while (n != 0) {
15        rem = n % 10;
16        n /= 10;
17        dec += rem * pow(2, i);
18        ++i;
19    }
20    return dec;
21}
22

1 /*
2 * C Program to Convert Binary to Hexadecimal 
3 * My Github: https://github.com/krishnan-tech
4 */
5#include <stdio.h>
6 
7int main()
8{
9    long int binaryval, hexadecimalval = 0, i = 1, remainder;
10 
11    printf("Enter the binary number: ");
12    scanf("%ld", &binaryval);
13    while (binaryval != 0)
14    {
15        remainder = binaryval % 10;
16        hexadecimalval = hexadecimalval + remainder * i;
17        i = i * 2;
18        binaryval = binaryval / 10;
19    }
20    printf("Equivalent hexadecimal value: %lX", hexadecimalval);
21    return 0;
22}

1#include <stdio.h>
2#include <string.h>
3#include <math.h>
4int binary_converter(char binary[], int length)
5{
6	int decimal = 0;
7	int position = 0;
8	int index = length - 1;
9	while (index >= 0)
10	{
11		decimal = decimal + (binary[index] - 48) * pow(2, position);
12		index--;
13		position++;
14	}
15	return decimal;
16}
17int main()
18{
19	printf("\n\t\t\tBINARY TO DECIMAL CONVERTER VIA TERMINAL\n\n\n");
20	char binary[500];
21	int decimal = 0;
22	int length;
23
24	printf("\t You have to enter a binary number and we will convert into decimal for you. type 'x' to exit\n");
25	while (1)
26	{
27		printf("BINARY : ");
28		scanf("%s", binary);
29		printf("\n");
30		length = strlen(binary);
31		for (int i = 0; i < length; i++)
32		{
33			if (binary[i] == 'x')
34			{
35
36				printf("\nThanks for using our Converter.\n\n");
37				return 0;
38			}
39			if (binary[i] < 48 || binary[i] > 49)
40			{
41				printf("%s is not a BINARY number. \n\n", binary);
42				break;
43			}
44			else
45			{
46				if (i == length - 1)
47				{
48					decimal = binary_converter(binary, length);
49					printf("DECIMAL = %d \n\n", decimal);
50				}
51				continue;
52			}
53		}
54	}
55
56	return 0;
57}